There are quite a few near IMM at Toh Guan Rd, Vkool, CoolnLite, both are good but quite expensive. I installed CoolnLite over at Toh Guan, their worksmanship and service is good, installation is in enclosed air-con area so reduce the dust during installation. U can rest & relax on the upper level where there are snooker to play or just sit at the sofa & watch VCDs while waiting for ur car to be done, drink will be serve too FOC. U can always look down from above and see how they work on ur car. Though is expensive but I like their worksmanship. There are cheaper grades to choose from too. Can check out
http://www.coolnlite.comNot sure about Vkool and other tints as never try before.